WIO Ryuoh Boulder Nano Stone brings mountain presence, iconic mineral veining, and natural river-shaped elegance to your scape — rounded calcareous limestone boulders in deep grey with pale white mineral veins, perfectly scaled for nano Iwagumi and stream compositions.

Ryuoh Boulder Nano Stone carries the same iconic Ryuoh DNA as the full-size boulder — deep grey calcareous limestone with pale mineral veins in its rounded, water-shaped form. Where classic Ryuoh reads as sharp ridges and dramatic cliff faces, the Boulder form trades edges for flow: rounded silhouettes, softened seams, and quiet veining that glows gently under light. Even at nano scale, a single piece creates natural-looking banks, meanders, and eddies that feel discovered rather than arranged.

Sized between 3 and 10 cm, ideal for nano tanks under 40L. As a calcareous limestone, Ryuoh may gently raise pH and hardness over time; routine water changes keep parameters steady. Pre-washed and ready to use.

Key Points

• Color: Deep grey with pale white mineral veins
• Nano Scale: Sized 3–10 cm, ideal for tanks under 40L / 10 gal
• Boulder Shape: Smooth, water-shaped rounded forms with softened veining
• River Realism: Creates natural-looking banks and eddies even in nano scapes
• Pre-Washed: Clean and ready to use, no soaking required
• Water Chemistry: Calcareous — may gently raise pH and hardness over time
• Versatile Use: Ideal for aquariums, terrariums, and paludariums
• Safe for fish, shrimp, and sensitive species
• Pairing Tip: Combine with Ryuoh Nano Stone for mixed angular and rounded compositions

Characteristics

• Type: Calcareous limestone (rounded/boulder form)
• Color: Deep grey with pale white mineral veins
• Texture: Smooth, rounded, water-shaped surfaces with softened seams
• Stone size: 3–10 cm
• Water Hardness: Calcareous — may gently raise pH and hardness; regular water changes maintain stability

Availability at Cuboid Nature Aquarium

• 2 kg Bag: Assorted mix of rounded boulders, 3–10 cm

Usage

• Rinse briefly before use to remove any transport dust — pre-washed and ready for direct placement
• Use one main boulder slightly off-axis to set direction; nest smaller pieces to form natural banks and channels
• Place over substrate or WIO LandForms — avoid direct contact with glass
• Use WIO ScapeBound to secure if needed
• Ideal for Iwagumi minimalism and convincingly natural river and stream biotopes
• Control any alterations in pH and kH by regular water changes with osmotic or soft water
• Safe for fish, shrimps, and other aquatic animals

Available from Cuboid Nature Aquarium — Authorized Retailer for WIO.